Battery charger



FIG. 1 is a rear view of a battery charger showing the new design.

FIG. 2 is a front view thereof.

FIG. 3 is a bottom view thereof.

FIG. 4 is a top view thereof.

FIG. 5 is a right side view thereof.

FIG. 6 is left side view thereof; and,

FIG. 7 is a front, top and right side perspective view thereof.

The broken lines shown in the drawings are included for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a battery charger, as shown and described. 